When you see water coming off the roof, you will know that the tank is full.
当看见有水从屋顶流下的时候，你就知道水箱满了。
2
In the middle of the roof is an air layer which is cooled and cleaned automatically by water spraying system linked to the rainwater collection tank.
屋顶的中部是通风口，通过连接雨水收集池的水喷淋装置自动化控制，实现冷凝和净化。
3
These are mounted on the roof and provide solar power to drive the pumps necessary for circulating the water over the roof and back to the tank beneath the building.